структура очереди сообщений XSI (XSI message queue structures)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
sys/msg.h — XSI message queue structures
Синопсис (Synopsis)
#include <sys/msg.h>
Описание (Description)
The <sys/msg.h> header shall define the following data types
through typedef:
msgqnum_t Used for the number of messages in the message
queue.
msglen_t Used for the number of bytes allowed in a message
queue.
These types shall be unsigned integer types that are able to
store values at least as large as a type unsigned short.
The <sys/msg.h> header shall define the following symbolic
constant as a message operation flag:
MSG_NOERROR No error if big message.
The <sys/msg.h> header shall define the msqid_ds structure, which
shall include the following members:
struct ipc_perm msg_perm Operation permission structure.
msgqnum_t msg_qnum Number of messages currently on queue.
msglen_t msg_qbytes Maximum number of bytes allowed on queue.
pid_t msg_lspid Process ID of last msgsnd().
pid_t msg_lrpid Process ID of last msgrcv().
time_t msg_stime Time of last msgsnd().
time_t msg_rtime Time of last msgrcv().
time_t msg_ctime Time of last change.
The <sys/msg.h> header shall define the pid_t, size_t, ssize_t,
and time_t types as described in <sys/types.h>.
The following shall be declared as functions and may also be
defined as macros. Function prototypes shall be provided.
int msgctl(int, int, struct msqid_ds *);
int msgget(key_t, int);
ssize_t msgrcv(int, void *, size_t, long, int);
int msgsnd(int, const void *, size_t, int);
In addition, the <sys/msg.h> header shall include the <sys/ipc.h>
header.
The following sections are informative.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
sys_ipc.h(0p), sys_types.h(0p)
The System Interfaces volume of POSIX.1‐2017, msgctl(3p),
msgget(3p), msgrcv(3p), msgsnd(3p)
